...but on reboot it won't boot from the disk. Just the flashing system folder icon.

Click to expand...

Teh Google seems to imply a few things about the PowerDomain 2940:

1: To be bootable on a B&W it needs a specific firmware version. (4.1 or better?) What did you put on your 2940UW?

2: There were a lot of suggestions that you use OS 8.6, or at least have some specific patch to 8.5.1, to avoid some sort of PCI bus handling bug in straight 8.5.1.

It wouldn't surprise me if a flashed card had some strange issue with booting. There are a lot of odd variations of the 2940 card/hardware and perhaps the Mac BIOS only really works 100% with a few specific ones.

EDIT: A NetBSD mailer thread on mac firmware variations for the 2940 family:

http://mail-index.netbsd.org/port-macppc/2001/04/27/0000.html